Voltech PM300 - Thd; Intg

G
ETTING
S
TARTED
PM100 / 300 U
SER
M
ANUAL
P
AGE
6 VPN 98-052
PM300
CH1 CH2 CH3 Σ
96.88 97.08 97.78 168.44 V rms
121.13m 134.38m 128.47m 127.99m AH01
Amplitude of harmonic in Amps
-002.3 -120.6 -242.4
°
Phase of harmonic
Use the [<] and [>] keys to scroll through harmonics 0 (dc) to 50.
Harmonic amplitude can be shown as absolute values by selecting ‘V/A/W’ in
menu 2. (See page 12 for example.)
THD Total Harmonic Distortion. V thd, A thd.
The power analyzer automatically selects the most accurate method of
calculation, depending on the level of THD. Press [A] or [V] to select A thd or
V thd. Press [THD] again to cancel THD display.
THD > 6%
(
)
%100 X
1
1
22
H
HRMS
df
−
=
THD < 6%
%100 X
1
....5432
2222
H
HHHH
thd
++++
=
See also the in [MENU] [4] for how to manually select the formula that is used
and [MENU] [2] for how to change the harmonic reference (the denominator in
the equations above).
INTG
Displays Integrated values.
Ah, Wh, VAh, VArh, PF (Average) and fundamentals are valid.
The period of integration is set in menu 2. Pressing the [INTG] key starts
integration, and displays any of the integrated values during integration.
Pressing the [INTG] key again returns the display to normal mode, integration
continues in the background until the time set in menu 2 is reached.
The orange LED is lit when the integrator is running. Press and HOLD the
[INTG] key to stop integration.